William john brewer



`(Nu Model.)

\ J. BREWER.

` PULLBYVBLocK.. l

Patented Dec. W5, 1882.

WITLVESSES UNITED STATES PATENT Uri-TCE wiLLIAM-J. BREWER, or Bonner', TNDIA.

PuLLEY-BLOCK.

sPEoIrrcArroNrerming per/e of Lettere Patent No. 268,455, dated December 5, 1882'.

Application filed March 22, 1882.

(No model.) Patented in India April 10, 1880, No. 27; in England April 17, l880, No. 1,588; in

France October 18, 1880, No. 139,214; '1n Belgium October 18, 1880, No. 52,796, and in Austria October 29, 1881, No. 26,478.

, To all whom it may concern.'

Be it known that I, WILLIAM JOHN BREW- ER, a subject of the Empress of India, residing at Bombay, India, have invented a new and useful Improvement in Tackle-Blocks, of which the followingis a specification.

This invention is part of my improvements in apparatus for reducing friction of axles, Src., patented in Great Britain by Letters Patent No. 1,588, dated April 17, 1880.

My present invention consists in an improved construction of tackle-blocks or pulley-blocks for hoisting-tackle, having reference to the employment or use therein of what I term rotary lever wheels,7 hereinafter termed lever-wheels, for reducing friction and distributing strain and wear without com-` plication. ot' parts and without unnecessary weight or bulk.

Figure 1 of the accompanying drawings is a side elevation ot'ian improved anti-friction tackle-block illustrating this invention. Fig. 2 is an edge view of the same, partly in section on the line 2 2, Fig. 1; and Fig. 3 is a like sectional edge view of another tackleblock embodying substantially the same invention.

Likeletters of reference indicate corresponding parts in all the figures.

The improved tackle-block illustrated by Figs. 1 and 2 has a pair of flat cheek-plates, a a, of suitable size and outline, united solidly at top and bottom bya pair ot' rivets, b c, which support said plates at a given distance apart and parallel with each other, and serve respectively in the example to attach a suspending-devis, d, and a depending hook, e. A pair of supplemental strain-bearing straps,

4 j' f, are likewise united by the same upper -inediately below the offsets i'ormed or supported by the angle-braces @vertical slots areA cut in the cheek-plates a and strapsf, to re- 5o ceive or accommodate the spindle ends or trunnions h h, belonging to a single grooved pulley, P, and those fi belonging to a pair of rotary lever-wheels, L L. A pulley and t pair of lever-wheels are inserted before the parts are united by the rivets b c, and in the finished block the peripheries of the rotary lever-wheels move in unison withand thus form substantially frictionless bearings for, said spindle ends or trunnions 71, of the pulley 6o P, said lever-wheels being adapted, owing to the reduced speed and correspondinglyreduced power at their spindles or trunnions t', to reduce and overcome frictional resistance at these points. To this end it is obviously E5 important that each lever-wheel le equally supported on both sides, so as to run `truly and without unequal strain, and this is accomplished without complication ot' parts and in a very light and compact block by the com- 7o bination of the said slotted straps and their braces with the said slotted cheek-plates.

The tackle-block illustrated b v Fig. 3 has parallel slotted cheek-plates a2 d2, rivets b2 c2,

a clevis, cl2, a hook, c2, slotted straps f2f2, with 7 5 angle-braces g2, pulley-spindle ends or trunnions h2, and lever-wheels L2 L2, with spindles 0r trunnions i2, which aresimilar to the parts correspondingly lettered in Figs. 1 and 2, save that the strapsfzf2 are extended dowu- 8o ward and bent inward below the lever-wheels L2, and united to each other and to the cheekplates t2 by the lower rivet, e2, so as to render the' structure stronger. Otherwise this block differs from the one first described in having two pulleys, `P1 P2, in place of the single pulley l?. Other styles ot' tackle-blocks may be constructed according to this invention in like manner.

My improved tackle-block frame is adapted 9o to be made wholly ot' a suitable metal or metalsiron and steel, for example. I do not, however, claim this per se. Neither do I claim broadly supporting the spindle or trunnions of the pulley orpulleysin the direction of strain by what I have termed lever-wheels; but

I claim- In a tackle-block havingapair ot' rotary lcver-Wheels to support the spindle or trunnions and supported by angle-braces, so as `to deof its pulley or pulleysin thedireetion of strain, pend parallel to said cheek-plates, substan tially ro the combination, as hereinbefore specified, of as shown, for the purpose set forth.-

a pair of slotted cheek-plates and a pair of London, 28d January, 1882.

supplemental strain bearing straps, united WILLIAM JOHN BREWER. A with each other and with the suspension alL- Witnesses: taehment al: the upper end of' the block, the HENRY THEO. TRIEMER,

lower ends of said straps being spread apart; EDWD. N. HOBBS. 

